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openssh/openssh-8.3p1-sshd_include.patch

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Unbreak corner cases of sshd_config include
2020-05-27 07:53:38 +00:00
From 3caa40f40c7f97ecf46969e050e530338864033e Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Mon, 25 May 2020 15:46:51 +0200
Subject: [PATCH 1/3] regress: Add more test cases
---
regress/servcfginclude.sh | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/regress/servcfginclude.sh b/regress/servcfginclude.sh
index b25c8faa..b6a9a248 100644
--- a/regress/servcfginclude.sh
+++ b/regress/servcfginclude.sh
@@ -146,9 +146,43 @@ Include
_EOF
trace "disallow invalid with no argument"
-${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i.x \
+${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i.x -T \
-C "host=x,user=test,addr=127.0.0.1" 2>/dev/null && \
fail "sshd allowed Include with no argument"
+# Ensure the Include before any Match block works as expected (bug #3122)
+cat > $OBJ/sshd_config.i << _EOF
+Banner /xx
+HostKey $OBJ/host.ssh-ed25519
+Include $OBJ/sshd_config.i.2
+Match host a
+ Banner /aaaa
+_EOF
+cat > $OBJ/sshd_config.i.2 << _EOF
+Match host a
+ Banner /aa
+_EOF
+
+trace "Include before match blocks"
+trial a /aa "included file before match blocks is properly evaluated"
+
+# Port in included file is correctly interpretted (bug #3169)
+cat > $OBJ/sshd_config.i << _EOF
+Include $OBJ/sshd_config.i.2
+Port 7722
+_EOF
+cat > $OBJ/sshd_config.i.2 << _EOF
+HostKey $OBJ/host.ssh-ed25519
+_EOF
+
+trace "Port after included files"
+${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i -T \
+ -C "host=x,user=test,addr=127.0.0.1" > $OBJ/sshd_config.out || \
+ fail "failed to parse Port after included files"
+_port=`grep -i '^port ' $OBJ/sshd_config.out | awk '{print $2}'`
+if test "x7722" != "x$_port" ; then
+ fail "The Port in included file was intertepretted wrongly. Expected 7722, got $_port"
+fi
+
# cleanup
rm -f $OBJ/sshd_config.i $OBJ/sshd_config.i.* $OBJ/sshd_config.out
--
2.25.4
From 924922fcb8f34fb4a156367de2ee33ad92a68a6a Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Mon, 25 May 2020 16:56:39 +0200
Subject: [PATCH 2/3] Do not call process_queued_listen_addrs() for every
included file
Fixes #3169
---
servconf.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/servconf.c b/servconf.c
index 5bb4b1f8..78a7d87d 100644
--- a/servconf.c
+++ b/servconf.c
@@ -74,7 +74,7 @@ static void add_listen_addr(ServerOptions *, const char *,
const char *, int);
static void add_one_listen_addr(ServerOptions *, const char *,
const char *, int);
-void parse_server_config_depth(ServerOptions *options, const char *filename,
+static void parse_server_config_depth(ServerOptions *options, const char *filename,
struct sshbuf *conf, struct include_list *includes,
struct connection_info *connectinfo, int flags, int *activep, int depth);
@@ -2580,7 +2580,7 @@ copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
#undef M_CP_STRARRAYOPT
#define SERVCONF_MAX_DEPTH 16
-void
+static void
parse_server_config_depth(ServerOptions *options, const char *filename,
struct sshbuf *conf, struct include_list *includes,
struct connection_info *connectinfo, int flags, int *activep, int depth)
@@ -2606,7 +2606,6 @@ parse_server_config_depth(ServerOptions *options, const char *filename,
if (bad_options > 0)
fatal("%s: terminating, %d bad configuration options",
filename, bad_options);
- process_queued_listen_addrs(options);
}
void
@@ -2617,6 +2616,7 @@ parse_server_config(ServerOptions *options, const char *filename,
int active = connectinfo ? 0 : 1;
parse_server_config_depth(options, filename, conf, includes,
connectinfo, 0, &active, 0);
+ process_queued_listen_addrs(options);
}
static const char *
--
2.25.4
From 26d970b4fb373cb7bd99286e41dd095cd1eadbd0 Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Tue, 26 May 2020 16:25:24 +0200
Subject: [PATCH 3/3] servconf: Fix parsing of Match blocks in included files
(#3122)
---
servconf.c | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/servconf.c b/servconf.c
index 78a7d87d..a8541514 100644
--- a/servconf.c
+++ b/servconf.c
@@ -554,6 +554,7 @@ typedef enum {
#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */
#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH)
#define SSHCFG_NEVERMATCH 0x04 /* Match never matches; internal only */
+#define SSHCFG_MATCH_ONLY 0x08 /* Match only in conditional blocks; internal only */
/* Textual representation of the tokens. */
static struct {
@@ -1265,7 +1266,7 @@ static const struct multistate multistate_tcpfwd[] = {
static int
process_server_config_line_depth(ServerOptions *options, char *line,
const char *filename, int linenum, int *activep,
- struct connection_info *connectinfo, int inc_flags, int depth,
+ struct connection_info *connectinfo, int *inc_flags, int depth,
struct include_list *includes)
{
char ch, *cp, ***chararrayptr, **charptr, *arg, *arg2, *p;
@@ -2012,7 +2013,9 @@ process_server_config_line_depth(ServerOptions *options, char *line,
parse_server_config_depth(options,
item->filename, item->contents,
includes, connectinfo,
- (oactive ? 0 : SSHCFG_NEVERMATCH),
+ (*inc_flags & SSHCFG_MATCH_ONLY
+ ? SSHCFG_MATCH_ONLY : (oactive
+ ? 0 : SSHCFG_NEVERMATCH)),
activep, depth + 1);
}
found = 1;
@@ -2060,7 +2063,9 @@ process_server_config_line_depth(ServerOptions *options, char *line,
parse_server_config_depth(options,
item->filename, item->contents,
includes, connectinfo,
- (oactive ? 0 : SSHCFG_NEVERMATCH),
+ (*inc_flags & SSHCFG_MATCH_ONLY
+ ? SSHCFG_MATCH_ONLY : (oactive
+ ? 0 : SSHCFG_NEVERMATCH)),
activep, depth + 1);
*activep = oactive;
TAILQ_INSERT_TAIL(includes, item, entry);
@@ -2078,11 +2083,14 @@ process_server_config_line_depth(ServerOptions *options, char *line,
if (cmdline)
fatal("Match directive not supported as a command-line "
"option");
- value = match_cfg_line(&cp, linenum, connectinfo);
+ value = match_cfg_line(&cp, linenum,
+ (*inc_flags & SSHCFG_NEVERMATCH ? NULL : connectinfo));
if (value < 0)
fatal("%s line %d: Bad Match condition", filename,
linenum);
- *activep = (inc_flags & SSHCFG_NEVERMATCH) ? 0 : value;
+ *activep = (*inc_flags & SSHCFG_NEVERMATCH) ? 0 : value;
+ /* The MATCH_ONLY is applicable only until the first match block */
+ *inc_flags &= ~SSHCFG_MATCH_ONLY;
break;
case sKerberosUseKuserok:
@@ -2385,8 +2393,9 @@ process_server_config_line(ServerOptions *options, char *line,
const char *filename, int linenum, int *activep,
struct connection_info *connectinfo, struct include_list *includes)
{
+ int inc_flags = 0;
return process_server_config_line_depth(options, line, filename,
- linenum, activep, connectinfo, 0, 0, includes);
+ linenum, activep, connectinfo, &inc_flags, 0, includes);
}
@@ -2591,14 +2600,15 @@ parse_server_config_depth(ServerOptions *options, const char *filename,
if (depth < 0 || depth > SERVCONF_MAX_DEPTH)
fatal("Too many recursive configuration includes");
- debug2("%s: config %s len %zu", __func__, filename, sshbuf_len(conf));
+ debug2("%s: config %s len %zu%s", __func__, filename, sshbuf_len(conf),
+ (flags & SSHCFG_NEVERMATCH ? " [checking syntax only]" : ""));
if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL)
fatal("%s: sshbuf_dup_string failed", __func__);
linenum = 1;
while ((cp = strsep(&cbuf, "\n")) != NULL) {
if (process_server_config_line_depth(options, cp,
- filename, linenum++, activep, connectinfo, flags,
+ filename, linenum++, activep, connectinfo, &flags,
depth, includes) != 0)
bad_options++;
}
@@ -2615,7 +2625,7 @@ parse_server_config(ServerOptions *options, const char *filename,
{
int active = connectinfo ? 0 : 1;
parse_server_config_depth(options, filename, conf, includes,
- connectinfo, 0, &active, 0);
+ connectinfo, (connectinfo ? SSHCFG_MATCH_ONLY : 0), &active, 0);
process_queued_listen_addrs(options);
}
--
2.25.4
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